I've already aired the room this morning.i've already aired the room in the morning.这两种表示哪种可以?是不是现在完成时不能用具体的时间状语比如 in the morning ,at 7 o'clock 但是可以用 this morning ,since 7 o'clock?
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I've already aired the room this morning.i've already aired the room in the morning.这两种表示哪种可以?是不是现在完成时不能用具体的时间状语比如 in the morning ,at 7 o'clock 但是可以用 this morning ,since 7 o'clock?
I've already aired the room this morning.
i've already aired the room in the morning.
这两种表示哪种可以?是不是现在完成时不能用具体的时间状语比如 in the morning ,at 7 o'clock 但是可以用 this morning ,since 7 o'clock?
I've already aired the room this morning.i've already aired the room in the morning.这两种表示哪种可以?是不是现在完成时不能用具体的时间状语比如 in the morning ,at 7 o'clock 但是可以用 this morning ,since 7 o'clock?
1 I've already aired the room this morning
--------一般感觉,说这句话的时候,时间仍然是morning time.
2 I aired the room this morning / in the morning
-------一般感觉,说话的时候已经不是 morning time了,所以用“一般过去时”.
3 I have been airing the room since 7 o'clock this morning
--------因为since 7 o'clock this morning的参与,你必须用“现在完成进行时”,要知道,在你的语境裏面,作为动词,air是瞬间性动词,不是延续性动词.
语法上的确如此,但是口语并非这么严格区分。